Dental tool.



Q/Vitneowo 9mm R- MQQ No. 770,162. PATENTED SEPT. 13, 19%.

R. M. CHASE.

DENTAL TOOL.

APPLICATION 21mm. MAR. 24, 1904.

NO MODEL Patented September 13, 1904;.

PATENT @EETQE.

ROLLA M. CHASE, OF BETHEL, VERMONT.

DENTAL TOOL.

SPECIFICATION forming part of Letters Patent No. 770,162, datedSeptember 13, 1904.

Application filed March 24:, 1904.

T0 ail whom it may concern.-

Be it known that I, RoLLA M. GHAsn, a citizen of the United States,residing at Bethel, in

the county of Windsor and State of Vermont, have invented certain newand useful Improvements in Dental Tools; and I do declare the followingto be a full, clear, and exact description of the invention, such aswill enable others skilled in the art to which it appertains to make anduse the same.

My invention relates to improvements in dental tools or instruments, andmore particularly to a pair of compressing pincers or forceps forpressing or punching a sheet of metal foil into a cavity in a tooth orin a matrix in order to take an impression of said cavity.

The object of my invention is to provide a simple, durable, andcomparatively inexpensive device of this character by means of which analmost perfect impression of a cavity may be quickly and easily made ina piece of gold, platinum, or other metal foil.

l/Vith this and other objects in View the invention consists of certainnovel features of construction, combination, and arrangement of parts,as will be more fully described, and particularly pointed out in theappended claims.

In the accompanying drawings, Figure 1 is a perspective view of myimproved device. Fig. 2 is a longitudinal sectional view of the same,one of the jaws of the device being provided with a cushion cap orcovering. Fig. 3 is a transverse sectional view taken on the line 3 3 ofFig. 2. Fig. 4 is a perspective view of the elastic cone-shaped punch ordie which is attached to one of the jaws of the device. Fig. 5 is asimilar view of the cushion cap or covering used upon the other jaw ofthe device.

Referring to the drawings by numerals, l and 2 denote two leverspivotally connected intermediate their ends in any suitable manner, butpreferably as shown at 3, so as to form a pair of pincers or forceps.The long ends or arms of said levers are curved to form handles 4, andthe short ends or arms of the same are curved, as shown, to form jaws orbeaks 5 and 6. The jaw 5 tapers slightly toward its end, which curvesinwardly toward $erial No. 199,794. (No model.)

the jaw 6 and terminates in a flat circular face or end 7, which isroughened by milling or serrating it in order to prevent said jaw fromslipping upon the surface of the matrix or other object with which it isadapted to be engaged. When the device is used upon a natural tooth in apersons mouth, it is necessary to protect said tooth against beingscratched or otherwise injured, so I provide said jaw with acushion-covering, preferably in the form of a tubular sleeve or cap 8,of rubber, which is slipped over the end of said jaw, as shown in Fig.2. The jaw 6 has a slightly-enlarged outer end or head 9, formed with atransverse opening 10, adapted to receive the shank or stem 11 of apunch or die 12 to detachably hold the latter upon said jaw. Said punchis cone shapethat is, it is tapered to a pointand it is formed of softor very elastic rubber or of any other suitable yielding or elasticmaterial.

The device is used in obtaining a foil matrix or impression of a cavityin a natural tooth or in a metal matrix which has been made from aprevious impression of the tooth-cavity, the object of making thesefoil-matrices being to produce metal inlays or fillings which are to becemented in cavities in molar teeth or to produce porcelain inlays orfillings which may be cemented in natural teeth, and also for makingporcelain inlay-fronts in gold crowns. When it is desired to make afoilmatrixtha t is, an impression in a piece of gold or platinum foil ofa cavity in a metal matrixa piece or sheet of foil of sufiicient size isplaced over said cavity and the matrix engaged by the jaws of the tool,the end 7 of the jaw 5 engaging that part of the matrix in rear of thecavity and the punch or die 12 engaging the foil and forcing it into thecavity, as will be readily understood. Owing to the shape and thematerial of which said punch is made, it will adapt itself to any sizeor shape cavity and will force the foil into all the interstices anddepressions of the entire cavity, thereby producing a perfect impressionor matrix. When the tool is used in the mouth to get a foil impressionor matrix of a cavity in a natural tooth,'the protective cushion 8 isused upon the jaw 5 to prevent injury to the teeth or gums. It will beseen that by means of the device a perfect impression ofa cavity may bequickly and easily made.

From the foregoing description, taken in connection with theaccompanying drawings, the construction and operation of the inven tionwill be readily understood without requiring a more extendedexplanation.

Various changes in the form, proportion, and the minor details ofconstruction may be resorted to without departing from the principle orsacrificing any of the advantages of this invention.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is

1. In a device of the character described,the combination of a pair oflevers pivotallyconnected intermediate their ends and each having a jawat one of its ends, and a cone-shaped punch or die of elastic materialupon one of said jaws, substantially as described.

2. In a device of the character described,the

combination of a pair of levers pivotally connected intermediate theirends and each having a jaw at one of its ends, a cone-shaped punch ordie of elastic material upon one of said jaws, and a protective cushionupon the other of said jaws, substantially as described.

3. In a device of the character described,the combination of a pair oflevers pivotally connected intermediate their ends and each having ahandle at one of its ends and a curved jaw at its opposite end, atapered, pointed punch or die of elastic material on the jaw of one ofsaid levers, and a tubular cap or covering of yielding material on thejaw of the other of said levers, substantially as described.

In testimony whereof I have hereunto set my hand in presence of twosubscribing witnesses.

ROLLA M. CHASE.

